Source 1 S1-TBSU306-S Owner's Manual & Installation Instructions page 18

Installation Instructions
Sample Wiring Diagrams
Heat Pump Systems
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial Heat Pump with
O Reversing Valve
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
Y1 1st Stage Compressor
(Cool or Heat)
G Fan
GAS
O
GAS/EL
7 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial Heat Pump with
O Reversing Valve.
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
Y1 1st Stage Compressor
(Cool or Heat)
Y2 2nd Stage Compressor
(Cool or Heat)
G Fan
Setup Step 31 is set to 2
(Number of Compressor Stages)
GAS
O
GAS/EL
ELEC
B
HP
ELEC
B
HP
6 Wire, 1 Stage Cooling, 2 Stage Heat
Residential & Commercial Heat Pump with
O Reversing Valve
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
Y1 1st Stage Compressor
(Cool or Heat)
W2 Aux Heat
G Fan
GAS
O
GAS/EL
8 Wire, 2 Stage Cooling, 4 Stage Heat
Residential & Commercial Heat Pump with
O Reversing Valve.
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
W3 4th Stage Heat
Y1 1st Stage Compressor
(Cool or Heat)
Y2 2nd Stage Compressor
(Cool or Heat)
G Fan
Setup Step 31 is set to 2
(Number of Compressor Stages)
GAS
O
GAS/EL
Note: When the unit goes into 4th stage
heating, there is no 4th stage indicator,
the display will still show 3rd stage.
14
ELEC
B
HP
ELEC
B
HP